Cutlery-grinding machine



F. PIHEMMING ET AL.

CUTLERY GRINDING MACHINE.

FILED SEPT 27.1921

Dec. 26, 1922.

Dec. 26, 1922.

NG ET- AL.

F. P. HEMMI CUTLERY GRINDING MACHINE.

3 SHEETS-SHEET 2- FILED SEPT. 27,1921.

I N VEN TORS A TTORNE Y.

Dec. 26, 1922.

F. P. HEMIVIING ET AL.

CUTLERY GRINDING MACHINE.

3 SHEETS-SHEET 3- FILED SEPT. 27,1921.

III [III llll l talented tilt-u,w 23h, ltiilz,

j 'uurrirn stares PATENT nings,

FRANK HEMIilIING- AND CARL HENRY HEMMING, OF NEW HAVEN, CONNECTICUT.

CUTLERY-GRINPING MTACHINE.

Application filed September 27, 1921. Serial N0. 503,578.

Tocll'whomizfmay concern: I

, Be it known that we, FRANK P. HEMMING and CARL H. IIEMMING, citizensof the United States, residing at New Haven, in the county of New Havenand State of Connecticut, have invented certain new and use fulImprovements in Cutlery-Grinding chines; and we do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains, tomake and use the same.

This invention relates to certain improvements in cutlery grindingmachines. In carrying out the invention, certain well known elementsrelating .to machines of this character are employed, such, forinstance, as an emery wheel, preferably of the hollow or cup shapedtype, rotatably mounted in close proximity to the blade to be ground,said blade being mounted on a holder attached to a reciprocating memberhaving a quick idle movement in one direc tion, 'andaslow' returnmovement for grinding; also the employment of well. known planet gearmechanism to effect the slow and rapid movement of the reciprocatingmember.

One of the objects of the present inven-' ported carriage, saidcarriageadapted to:

have a movementto and from the grinding wheelv A coarse pitch screw isournaled in the carriage carrying a nut adapted to,

engage with adjustable mechanism on the underside of the sliding plateto reciprocate said plate. At the termination oi? the quick idle travelof the sliding plate it is l1]'l})l-' live that it be brought firmlyagainst a stop in order to positively locate the shoulder o'lv the knifeblade with respect to the grinding wheel. For this purpose, the nutallowed an idle travel beyond the predetermined p p shaft 5 carrying theemery grinding wheel idle travel of the slide, and a reverse idle travelwhile the carriage is being moved toward the grinding wheel.

Another improved feature consists in assembling the planet gearmechanism within a pulley, and mounting the pulley on the shaft of theslide actuating screw to serve both as a driving pulley and a balancewheel to maintain a steady and continuous rotation of the screw. 1

Referring to the accompanying drawings wherein the same referencecharacters in dicate like parts throughout the several views:

, Figure 1 represents a plan view of the machine showing the carriage inits outer position with respect to the grinding wheel, and the slidingplate located at the termination of the idle travel, also sectional viewof the handle lever;

Figure 2 is aside elevation of the ma chine looking in the direction ofarrow a, Figure 1;

Figure 3 is a view of the machine looking in the direction of arrow 7),Figure 1.;

1F igure 4 is a plan view of the carriage with the sliding plateremoved, also seetional view of the driving and loose pulleys mounted onthe screw shaft, and sectional view of the handle lever;

Figure 5 is a detail elevation of the driv ing pulley and planet gearmechanism with the loose pulley removed;

Figure 6 is a broken view of the neck of the carriage andscrew shaft,and sectional view of the driving pulley with the loose pulley removed,showing the planet gear mechanism in position for a slow return movementof the sliding plate to grind;

Figure 7' is a detail inside view of the sliding plate;

Figure 8 is a sectional view of the sliding platoon line 8, 8, of Figure7, and broken view of the sliding plateactuating screw, and i v 7 Figure9 is a broken view of the slide actuating nut, part of the slidemechanism, full view of the follower and its siiipport showing theroller carried by the nut "forced to oneside to permit the return of thecarriage,

The principal common features incidental to machines of this charactercomprise the bed 1., slide 2, adjusting screw 3 therefor, slidestandards 4 in which is journaled the 6, and the tight and loose pulleys7 and 7 8 is a plate adapted to be set at any angle with respect to thegrinding wheel and is secured in any of its adjusted positions by meansof the bolts 9 projecting from the bed 1.

The carriage 10 is provided with the foot 11 pivotally supported at onecorner on the stud 121, Figure 3, of the base plate 8 and it projectsthrough the huh 13, Figures 1 and 4, of the carriage foot 11.

The shaft ends 14, 15, of the screw 16 are journaled, Figure4, in theends oi the carriage. The latter shaft carrying the driving pulley 17with its internal planet gear mechanism and. adjacent-clutch mechanism,pi'esefntly tohe more fully described.

17% is. a loose pulley adjacent to pulley 17. 18 is a nut operativelymounted on the screw 16 having the lug 1-9'adapted to effect alongitudinal reciprocating movement of the sliding plate 20,1nounted onthe oar-1 riage, by its contact with'the adjustahle r od 21, Figuresiand 8,,mounted. in the bracket 22, and the rod- 23 01% the bracket 24located in alignment; {with the rod 21. 253isa sprang on rod? 23;adaptedv tohecompressedthrough;

the medium of the sleeve 26 when, the lug 19cOntacts with the end oftherod,g as

shown in Figure 8. Thewpositioir of rod 23 and sleeve 26. are adjustedbymeans of the j am nuts 27, 28 mounted on the endsof said rod. 29 is theknil elolade holder which may beof any desiredv constructionbest adaptedto support the blade to he-gnound.

30 is a bracket projecting :fn'ofm the nut. 18, carrying the, lever-x31pivoted thereto, and is normally held against the pi Ih'32, Figure 4, ofthe hraclret'hy the spring '33. 34 is a roll in the outer end oi th'elever I adapted to. travel along the: face of the former 35 during thetravel of the nut 18-. The former being reinov'ahly mounted. 1n

the standard 36 attached, Figures 1', 2, and;

8, to the stationary plate 8; 1 I

The pulley 17, Figures 4, 5, and 6, has the arm 37 journa-led 'on theshaft end 15 of screw 16', The gear 38 is fast-to.

the shaltaandthe gear 39, with itsclutch sleeve 40, is journaled on theshaft. 461: 2L11d 42 are short shafts anchored in. the pulley arm and onwhich are j ourn'ale'di the pinions 43, 44 45, and 46, meshingwitlrgears- 38 l Vhen the clutch pins 47 of the and 39. v gear 39, andtheclutch pins 48 01 the'pulley arm are engaged, Figure 4; and theclutch. this 49"oit the clutch sleeve are disei'i'gaged from the pin 150*o't the carriage extension 51;,the' gears anidpinions-Willbe locked,to the pulley and all rotate together for afast rotation of thescrew16to'- 1111- part a rapid 4501 m idle travel of the I Wllten* thefclutch pli1is-49 are; locked to the stationary pin 50- ofthe oarria-ge,and; the. clutch pins1:47,,=48; disen sleeve-40, Figureojthe gear -39will remain sta tlbn'ary, and i the rotation oi 'the' pulley- 171 wi 11-carry the-pin ions 43', 44, 45-, and46,

rod, is operatiively supported in the-standards 56,57,;ofthe1carriage'foot 11. As'the lever 52 is located above theshipperrod 54,1 itiisv connected therewith through the medium of i theblock 58 and the 'short I'OCl59L, v

Theopera'tion of the machine is as, f0llowscv 1 'At the terminationyofthe forward idle travel; of the sliding plate 20,. the, lug 60, Figure7, oil the plateshould be" forcibly brought against: the stop 61,Figure- 4, of

the carriage-10. 'Ihis; stop is. intended to locate the posit'ioniot'the: shoulder; of a;

knife blade with respect to-the= corner of the grinding wheeL so' thatthe corner: of

the wheel will always engagea'said shoul der before thegrindingoperation of the nest of. the blade begins. I

There are, however, several causes: operatingto pizevent thepositivecontact of the lugg 60 with the stop" 61, suc hyfor. instance,

as. the lost motion due to the wear of the mechanism for actuatingthereciprocating slide, or undue tlghtness; or lack of lulorication of theslide willcause' it to lag he hind and fall short of the proper haltingpoint. i

To insure-positive engagement of the slide wlth the carriage stop,thenut 18* of the screw will continue its inwardwtravel beyond theprcdeteninined travel of the slide, and, n doing so, will compress thespring. 25, Figure 8, through; the medium of the lug 19 of. the; nut, asbefore mentioned. DUPlnglJlHS spring oompnession, the trip 62,

carried by thebracket 30- of the nutQFig ure 4, will engage theadjustablestop 630'11 rodi 54 to;reverse' said rod and engage theclutchpins 49, 50, 'ior apre'limin'airy slow idle reverse-travel ofthenut. i

. This idle reverse movement of the not will bring theroll 34 first inContact with the incline 64 oi the former- 35. As the roller ls-moved upthisincline, it crowds the carri e'e" 10* gradually towarchthie grindingwheel in the direction of'arrow 0, Figure 1, which graduahmovement ofthe carriage is essential Where a large amount of stock has to" beremoved from a blade, as it en j ables the gnin'dingwheel to graduallyWork its way to the proper "depth into the stock of the blade" withoutapparent injury to the sharp cornei o'l"the-wheel, result that could notbe obtained were the carriage suddenly thrown its ultimate distance atonce.

As soon as the roll 34 has reached the straight face 35 of the former,the idle travel of the nut will cease, and its lug 19 will contact withthe rod 21 of the slide and carry said slide slowly back during thegrinding operation, and when said grinding operation is completed, thetrip 62 will contact with the adjustable stop 65 and halt the travel ofthe nut by the disengagement of the clutch pins l9, 50. Before thistripping is effected, the adjustable rod 66, Figure 9, of the carriagewill contact with the roll carrying lever 31 and throw the roll out ofvertical alignment with the bracket 30 so that the carriage may bereturned against the adjustable stop screw 67 by the spring 68 locatedbetween the projection 69 of the stationary plate 8, and the projection70 of the carriage foot 11, as shown more clearly in Figures 1 and 2. Asgrinding wheels vary in texture, it is iecessary that a soft orsemispongy wheel remain in operation longer at the shoulder of the bladebefore the slide has started slowly back, than would be required of awheel of harder texture. This idle travel of the nut is regulated inaccordance with the texture of the grinding wheel by means of theadjusting rod 2]. of the slide. In other words, the distance between theinner end of the rod Ql and the lug 19 of the nut is increased ordecreased to give a longer or shorter idle travel to the nut before itslug 19 contacts with said rod to effect the reverse movement of thesliding plate 20.

The face 55 of the former is shown as a straight surface, for thepurpose of grinding the straight faces of cutlery blades, but it will beunderstood that any irregular shaped article can be ground on thismachine by simply changing the contour of the former, to correspond tosuch irregular articles.

Having thus described our invention what we claim is 1. A. cutlerygrinding machine comprising a grinding wheel, a pivotally supportedcarriage. a knife holder carrying sliding plate adapted to have areciprocating movement on the carriage, a rotatable screw journaled inthe carriage, a nut op 'atively mounted on the screw, means on the plateadapted to be engaged by the nut to reciprocate the plate, one of saidmeans being adjustable to enable the nut to have a predetermined idletravel on the screw and means to effect a lat eral n'iovement ofthe'carriage toward the grinding wheel when the plate is at rest.

2. A. cutlery grinding machine comprising a grinding wheel, a pivotallysupported carriage, a sliding plate adapted to have a re ciprocatingmovement on the carriage, means to effect a lateral movement of thecarriage toward the grinding wheel, a rotatable screw ournaled 1n thecarriage, a nut operatlvely mounted on the screw, means on the plateadapted to be engaged by the nut to reciprocate the plate, one of saidmeans under spring tension topern'iit the nut to have an idle travel inone direction to insure the plate being brought against a positive stop,the other of said means being adjustable to permit the nut to have apredetermined idle travel in the opposite direction while the plate isat rest and during said lateral movement of the carriage.

A cutlery grinding machine comprising an abrasion wheel, a stationarysupport, a carriage pivotally mounted on the support and adapted tohaving a swinging movement to and from the abrasion wheel, a slidingplate mounted on the carriage, a knife holder on the plate, a screwjournaled in the carriage, a traveling nut mounted on the screw, meanson the plate adapted to be engaged by the nut to reciprocate the plate,a driving pulley mounted on the screw shaft, planet gear mechanismlocated within the pulley, said pulley and planet gear mechanism adaptedto effect a rapid idle travel of the sliding plate in one direction, anda slow reverse travel in the opposite direction.

4. A cutlery grinding machine comprising a carriage, a plate mountedthereon, a knife holder on the plate, a rotatable screw journaled in thecarriage, a nut having a reciprocating travel on the screw, means on theplate to be engaged by the nut to reciprocate the plate and also effecta predetermined idle travel of the nut in either direction when theplate is at rest.

5. A cutlery grinding machine comprising an abrasion wheel, a pivotallysupported carriage, a sliding plate mounted on the carriage, a screwjournaled in the carriage, means for rotating the screw, a nut mountedon the screw and having a reciprocating travel thereon, means on theplate to be engaged by the nut to reciprocate said plate and also effectan idle travel of the nut in either direction while the plate is halted,a former adjacent to the carriage having an incline face at one endthereof, means on the nut adapted to engage said incline and thus causethe carriage to be moved toward the abrasion wheel while the plate ishalted, and means for returning the carriage at the conclusion of thegrinding operation.

6. A cutlery grinding machine comprising an abrasion wheel, pivotallysupported can riage, a reciprocating plate mounted thereon, a knifeholder on the plate, a rotatable screw journaled in the carriage, areciproeating nut mounted on the screw, nut engaging means on the platewhereby said plate is reciprocated and halted to allow the nut to havean idle travel in either direc tion, a stationary former having anincline returning the carriage after the grinding 0pfxce, a roll carriedby the nut under spring eration. v tens-ion to engage saidinoline temovethe car- In testimony whereof We affix our signa- 10 rialgeinto Contactwith the abrasion Wheel tures.

5 While the plate is ha1ted,1neans fortempod rarily disengaging theroll'froln its operative 1?. engagement With the former, and means forCARL HENRY HEMMING.

